Just to clarify, there are a lot of 900 series area codes (like in the 902 Nova Scotia example discussed above) but it is specifically the 900 prefix that is reserved for TOLL calls whereby the owner charges you for every minute you are on the line, not to be confused with the 800 TOLL FREE prefix. If you dial a number that begins with 900, you will be charged an unknown toll per minute for as long as they keep you on the line and it will show up on your phone bill as a charge.